Can external forms be accessed by external users without VPN through nintex mobile?

What do you mean by 'external forms'?

Using Nintex Live, you can set the form to allow anonymous access and then anyone can access and fill out the form simply by clicking a link.

What i meant,When we install nintex app and use corporate account it works for users within the organization with VPN access.I don't see microsoft account option on nintex mobile app for external users to use the mobile app.